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Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Crystal Field Theory
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Updated: Jul 31, 2025

Fabrication of Spatially Confined Complex Oxides
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Controlled Electronic and Magnetic Landscape in Self-Assembled Complex Oxide Heterostructures.

Dae-Sung Park1,2,3, Aurora Diana Rata4, Rasmus Tindal Dahm2

  • 1Institute of Materials, Swiss Federal Institute of Technology-EPFL, Lausanne, 1015, Switzerland.

Advanced Materials (Deerfield Beach, Fla.)
|May 8, 2023
PubMed
Summary

Researchers developed a novel method for creating complex oxide heterostructures by combining 2D layer-by-layer and 3D vertically aligned nanostructure (VAN) film growth. This technique allows for tunable interfacial properties and emergent phenomena for advanced applications.

Keywords:
2DEGsfunctional oxidesmagnetismself-assemblythin film growth

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Complex oxide heterointerfaces exhibit unique physical properties crucial for emerging technologies.
  • Vertically aligned nanostructure (VAN) films offer structural flexibility and property tunability in complex oxide heterostructures.
  • Bottom-up self-assembly methods are promising for designing advanced functional materials.

Purpose of the Study:

  • To explore a new bottom-up self-assembly approach for creating two-phase nanocomposite thin films.
  • To investigate the 2D layer-by-layer to 3D VAN film growth transition in complex oxides.
  • To control interfacial properties and emergent phenomena in engineered heterostructures.

Main Methods:

  • Utilized a mixed deposition approach combining 2D layer-by-layer and 3D VAN film growth.
  • Grew LaAlO3:LaBO3 two-phase nanocomposite thin films on a SrTiO3(001) substrate.
  • Controlled the 2D-to-3D structural assembly via composition ratio.

Main Results:

  • Achieved a transient structural assembly from 2D to 3D growth.
  • Demonstrated the coexistence of multiple interfacial properties, including 2D electron gas and magnetic anisotropy.
  • Successfully created multidimensional film heterostructures with tunable properties.

Conclusions:

  • The developed approach enables the creation of complex oxide heterostructures with tailored interfacial properties.
  • This method provides a pathway to engineer emergent phenomena for multifunctional applications.
  • Composition ratio is a key parameter for controlling the 2D-to-3D structural transition and resulting properties.